The human body is made of chemicals. And it is a chemical factory and processor.
To indiscriminately condemn a food as being a chemical or comprised of chemicals is somewhat like using cult to slam someone’s social group association.
Of course, there are good chemicals and bad chemicals, depending on their context.
Water is a chemical. And it is a chemical that supports life on this planet. Fish can get oxygen from water, but we may drown if we try try this.
It is natural for us to politically and emotionally charge words without knowing their meaning. And there are many people with some level of education about chemistry who should know better than to use this word in a pejorative manner. This greatly plays into the hands of hucksters.